Zn-Al合金超声空化数值模拟和细晶强化机理研究  

Numerical Simulation of Ultrasonic Cavitation in Zn-Al Alloy and Study on Its Grain Refinement and Strengthening Mechanism

作　　者：陈海燕[1] 王超[1] 潘美诗 吉西西 曾越 安义博 邹燕成 CHEN Haiyan;WANG Chao;PAN Meishi;JI Xixi;ZENG Yue;AN Yibo;ZOU Yancheng(School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China;Huizhou Huiyang Guangjie Hardware Products Co.,Ltd.,Huizhou 516221,Guangdong,China)

机构地区：[1]广东工业大学材料与能源学院,广州510006 [2]惠州市惠阳广杰五金制品有限公司,广东惠州516221

出　　处：《材料导报》2023年第7期149-154,共6页Materials Reports

基　　金：广东工业大学大学生创新训练项目(xi2022118450638)。

摘　　要：为了研究超声波对ZnAl8合金的显微组织和性能的影响,在390℃的ZnAl8合金熔池中开展了不同功率的超声熔炼试验,结合数值分析法求解KM-polytropic和Mettin方程,研究了ZnAl8熔池中超声空化泡群的生长规律和空化效应。研究表明:当超声功率为700 W时,固液共存区390℃时施加超声振动能有效消除树枝晶组织,超声产生的脉冲压强达到200 MPa以上,泡壁温度高达3200 K,对先析出的α(Al)相进行了有效破碎和熔蚀,碎片成为结晶的形核点,凝固后获得了均匀的α(Al)相细小蔷薇组织;铸态合金的断后伸长率为13.62%,抗拉强度达到232 MPa,与不施加超声的常规熔铸的合金相比,其塑性和强度分别提高了48%、12%。In order to study the effect of ultrasonic on the microstructure and properties of ZnAl8 alloy,ultrasonic melting experiments with different po-wer were carried out in the molten pool of ZnAl8 alloy at 390℃.In combination with numerical analysis method to solve the KM-polytropic and Mettin equations,the growth law and cavitation effect of ultrasonic cavitation and bubble group in the molten pool of ZnAl8 alloy were studied.The results showed that when ultrasound was 700 W,the application of ultrasonic vibration in the solid-liquid coexistence zone at 390℃effectively eliminated the dendritic structure,the pulse pressure generated by ultrasonic reached more than 200 MPa,the bubble wall temperature reached as high as 3200 K,and the effective crushing and pre-precipitatedα(Al)phase were carried out and the fragments became nucleation points of crystallization.After solidification,uniformα(Al)phase microstructures were obtained.The elongation after fracture of the as-cast alloy was 13.62%,and the tensile strength reached 232 MPa,in contrast to conventional melt casting techniques without ultrasonic,the plasticity and strength of the alloy were increased by 48%and 12%,respectively.

关 键 词：超声波 数值分析 超声空化效应 锌铝合金 

分 类 号：TG425.1[金属学及工艺—焊接]